/*
 * Anything: A flexible and easy to use data structure that combines the 
 * characteristics of a list and a hashmap into one data structure.
 * 
 * Based on a paper by Peter Sommerlad and Marcel Rueedi on 
 * 'Do-it-yourself reflection' entered at EuroPLOP 1998.
 * 
 * This library was written completely from scratch and is based only 
 * in spirit on the original Java Anything implementation written by 
 * Andre Weinand/Marcel Rueedi in 1997/99 and enhanced by Stefan Tramm 
 * in 2006.
 * 
 * Copyright (c) 2008 Thomas Marti and others. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package any.functor.impl.func;

import java.util.List;

import any.ImmutableAny;
import any.functor.Functions;
import any.functor.interfaces.AnyIteratingFunction;
import any.functor.interfaces.AsList;
import any.functor.interfaces.Function;
import any.functor.interfaces.FunctionTypedPredicate;
import any.functor.interfaces.OrderableIteratingFunction;
import any.incubator.GenericListCreator;
import any.incubator.ListCreator;

import static any.functor.Functions.asIterable;
import static any.functor.Functions.asObjectIfNull;

public class AsListImpl<T> 
	extends BaseAnyFunction<T, Void, AsListImpl<T>> 
	implements AsList<T> {

	private final ListCreator<T> DEFAULT_LIST_TYPE = Functions.<T>arraylist();

	Function<ImmutableAny, T> asFunc;
	ListCreator<T> listType;
	
	
	public List<T> apply(ImmutableAny from) {
		int size = 16; //TODO: Wieso 16???
		if (!from.onlySequentialAccess()) {
			size = from.size();
		}
		
		List<T> result = (listType != null ? listType.create(size) : DEFAULT_LIST_TYPE.create(size));
		for (T next : from.give(asIterable().select(predicate).eachElement(asObjectIfNull(asFunc)).order(direction))) {
			result.add(next);
		}
		
		return result;
	}
	
	@SuppressWarnings("unchecked")
	public <X> AnyIteratingFunction<List<X>> eachElement(Function<ImmutableAny, X> func) {
		this.asFunc = (Function<ImmutableAny, T>)func;
		return (AsListImpl<X>)this;
	}
	
	@SuppressWarnings("unchecked")
	public <X> OrderableIteratingFunction<List<X>> select(FunctionTypedPredicate<X> predicate) {
		this.asFunc = (Function<ImmutableAny, T>)predicate.getAsFunction();
		super.select(predicate);
		return (AsListImpl<X>)this;
	}

	public AsList<T> ofType(ListCreator<T> listType) throws NullPointerException {
		if (listType == null) throw new NullPointerException();
		this.listType = listType;
		return this;
	}
	
	@SuppressWarnings("unchecked")
	public AsList<T> ofType(Class<? extends List> cls) throws NullPointerException, IllegalArgumentException {
		listType = new GenericListCreator(cls);
		return this;
	}
	
	@Override
	public String toString() {
		return "AsList of type" + listType;
	}
	
}
